The knob closest to the neck is a master volume, and the bigger switch on the bottom is a 3 position pickup selector. The other smaller switch is a 3 position switch, but I can't figure out exactly what it does. The knob on the bottom has a center detent, and the other doesn't. The two knobs seem like they might be treble and bass boost/cut, but depending on the position of the smaller 3 position switch the effect they have is different. Anyone know what the controls do?

I have no help for you, just wanted to say that my first bass was a JBS that I bought for $100 in a local shop. It's such a mutant now, I've re-finished, re-wired and replaced the pick-ups. I'm about the slap a fretless neck on it just for the halibut.

Just a shot in the dark, but maybe the toggle is a series/parallel/boost like in a G&L? As for the knobs, I don't see what the knob without the detent could be, considering you already have a pickup selector. It would make sense for them to be treble and bass controls, but wouldn't they both have detents? Strange...

Originally posted by Turock Supposedly you can download a PDF owners manual for a Jazz Bass Special at Mr. Gearhead, but I haven't been able to download any of the manuals that I have been interested in having.

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i checked out mr. gearhead and found the manual for the p and j basses of '87. It turns out the controls on this bass (which is a "power" jbs) is master vol, tone, freq sweep, 3 way pickup selector switch, and 3 way circuit select switch. The circuit select switch has passive, bass boost, and mid boost settings.